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      <h1 class="post-title">ClojureScript使用npm模块</h1>

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        <span class="post-time"> 2018-07-16 </span>
        
          <span class="more-meta"> 约 677 字 </span>
          <span class="more-meta"> 预计阅读 2 分钟 </span>
        
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  <h2 class="post-toc-title">文章目录</h2>
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    <div class="post-content">
      <p>Javascript现在的生态系统一点也不输Java的生态，而且还在以高速的发展事态占领了企业招聘的热门技术榜单。Javascript社区不仅充满激情、创新，而且非常具有活力，同时也是一个非常开放的社区，从其他的编程语言借鉴了很多优点。</p>
<p>Javascript社区如此丰富的模块与库，作为ClojureScript的使用者也不得不来使用npm的模块。下面简单介绍一下如何在ClojureScript里面使用npm的module，这里用react为例说明如何使用。</p>
<!-- raw HTML omitted -->
<h1 id="requirement">Requirement</h1>
<ol>
<li>leiningen</li>
<li>figwheel</li>
<li>cljsbuild</li>
<li>React</li>
<li>ReactDom</li>
</ol>
<h1 id="create-project">Create project</h1>
<div class="highlight"><div class="chroma">
<table class="lntable"><tr><td class="lntd">
<pre class="chroma"><code><span class="lnt">1
</span></code></pre></td>
<td class="lntd">
<pre class="chroma"><code class="language-fallback" data-lang="fallback">lein new figwheel hello-world
</code></pre></td></tr></table>
</div>
</div><p>直接使用figwheel的templaate来创建项目</p>
<h1 id="add-dependencies">Add dependencies</h1>
<p>修改<code>project.clj</code>，在<code>cljsbuild</code>修改id为dev的<code>:compiler</code>内容，添加如下代码：</p>
<div class="highlight"><div class="chroma">
<table class="lntable"><tr><td class="lntd">
<pre class="chroma"><code><span class="lnt">1
</span><span class="lnt">2
</span><span class="lnt">3
</span><span class="lnt">4
</span></code></pre></td>
<td class="lntd">
<pre class="chroma"><code class="language-clojure" data-lang="clojure"><span class="ss">:closure-defines</span> <span class="p">{</span><span class="nv">process.env/NODE_ENV</span> <span class="s">&#34;development&#34;</span><span class="p">}</span>
<span class="ss">:install-deps</span> <span class="nv">true</span>
<span class="ss">:npm-deps</span> <span class="p">{</span><span class="ss">:react</span> <span class="s">&#34;16.4.1&#34;</span>
           <span class="ss">:react-dom</span> <span class="s">&#34;16.4.1&#34;</span><span class="p">}</span>
</code></pre></td></tr></table>
</div>
</div><p>id为min的<code>:compiler</code>内容，只是修改了<code>:closure-defines</code>：</p>
<div class="highlight"><div class="chroma">
<table class="lntable"><tr><td class="lntd">
<pre class="chroma"><code><span class="lnt">1
</span><span class="lnt">2
</span><span class="lnt">3
</span><span class="lnt">4
</span></code></pre></td>
<td class="lntd">
<pre class="chroma"><code class="language-clojure" data-lang="clojure"><span class="ss">:closure-defines</span> <span class="p">{</span><span class="nv">process.env/NODE_ENV</span> <span class="s">&#34;production&#34;</span><span class="p">}</span>
<span class="ss">:install-deps</span> <span class="nv">true</span>
<span class="ss">:npm-deps</span> <span class="p">{</span><span class="ss">:react</span> <span class="s">&#34;16.4.1&#34;</span>
           <span class="ss">:react-dom</span> <span class="s">&#34;16.4.1&#34;</span><span class="p">}</span>
</code></pre></td></tr></table>
</div>
</div><p><code>:closure-defines</code>定义的内容，可以直接在cljs里面进行读取。</p>
<h1 id="source-code">Source code</h1>
<p>ClojureScript代码如下：</p>
<div class="highlight"><div class="chroma">
<table class="lntable"><tr><td class="lntd">
<pre class="chroma"><code><span class="lnt"> 1
</span><span class="lnt"> 2
</span><span class="lnt"> 3
</span><span class="lnt"> 4
</span><span class="lnt"> 5
</span><span class="lnt"> 6
</span><span class="lnt"> 7
</span><span class="lnt"> 8
</span><span class="lnt"> 9
</span><span class="lnt">10
</span><span class="lnt">11
</span><span class="lnt">12
</span><span class="lnt">13
</span></code></pre></td>
<td class="lntd">
<pre class="chroma"><code class="language-clojure" data-lang="clojure"><span class="p">(</span><span class="kd">ns </span><span class="nv">hello-world.core</span>
  <span class="p">(</span><span class="ss">:require</span> <span class="p">[</span><span class="nv">react</span> <span class="ss">:refer</span> <span class="p">[</span><span class="nv">createElement</span><span class="p">]]</span>
            <span class="p">[</span><span class="nv">react-dom</span> <span class="ss">:refer</span> <span class="p">[</span><span class="nv">render</span><span class="p">]]))</span>

<span class="p">(</span><span class="nf">enable-console-print!</span><span class="p">)</span>

<span class="p">(</span><span class="nf">js/console.log</span> <span class="s">&#34;Node enviornment is&#34;</span> <span class="nv">process.env/NODE_ENV</span><span class="p">)</span>

<span class="p">(</span><span class="k">def </span><span class="nv">appDiv</span> <span class="p">(</span><span class="nf">.getElementById</span> <span class="nv">js/document</span> <span class="s">&#34;app&#34;</span><span class="p">))</span>

<span class="p">(</span><span class="nf">render</span>
 <span class="p">(</span><span class="nf">createElement</span> <span class="s">&#34;h1&#34;</span> <span class="nv">nil</span> <span class="s">&#34;Hello, World!&#34;</span><span class="p">)</span>
 <span class="nv">appDiv</span><span class="p">)</span>
</code></pre></td></tr></table>
</div>
</div><p>require部分的使用跟cljs的包一样，可以直接从一个包require函数以及对象，剩下的部分就跟js使用react/react-dom的方式一样，调用render函数渲染元素到指定的html节点下面。</p>
<h1 id="run">Run</h1>
<div class="highlight"><div class="chroma">
<table class="lntable"><tr><td class="lntd">
<pre class="chroma"><code><span class="lnt">1
</span></code></pre></td>
<td class="lntd">
<pre class="chroma"><code class="language-fallback" data-lang="fallback">lein figwheel
</code></pre></td></tr></table>
</div>
</div><p>使用此命令运行代码，编译完成后figwheel会自动打开浏览器访问：<a href="http://localhost:3449/index.html"><code>http://localhost:3449/index.html</code></a>，完成后你会看到下面的内容：</p>
<p><img src="/img/cljs_npm_react_module.png" alt=""></p>

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